function bubbling(arr) {
  for(var i = 0; i<arr.length-1;i++) {
    for(var j = 0;j<arr.length-i-1;j++) {
      if(arr[j]>arr[j+1]) {
        [arr[j], [arr[j+1]]] = [arr[j+1], arr[j]]
      }
    }
  }
  return arr
}